Cisco NIM-2FXS/4FXO 2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module

The Cisco NIM-2FXS/4FXO is a six-port analog voice Network Interface Module designed for compatible Cisco Integrated Services Routers. It combines two FXS/FXS-E/DID ports with four FXO ports, providing flexible connectivity for analog telephones, fax devices, PBX equipment, and analog PSTN lines.

The module is designed for Cisco's fourth-generation voice architecture and includes an onboard DSP for voice functionality, eliminating the need for a dedicated packet voice DSP module on the router motherboard for supported voice applications. It supports voice and Unified Communications services, including Cisco Unified Communications Manager Express (CME) and Media Gateway Control Protocol (MGCP).

Key Features

• Model: Cisco NIM-2FXS/4FXO
• Total Ports: 6 analog voice ports
• 2 × FXS/FXS-E/DID ports
• 4 × FXO ports
• Designed for compatible Cisco ISR platforms
• Integrated DSP for voice processing
• Supports analog voice and fax applications
• Supports Cisco Unified Communications Manager Express (CME)
• Supports Media Gateway Control Protocol (MGCP)
• Supports Foreign Exchange Station (FXS) and Foreign Exchange Office (FXO) interfaces
• Supports DID applications
• Hot-swappable Network Interface Module design on supported platforms
• Suitable for voice gateway and Unified Communications deployments

Port Configuration

The two FXS ports can connect analog devices such as telephones, fax machines, and other analog endpoints. The four FXO ports provide connectivity to analog telephone service lines and other compatible external voice equipment.

Compatible Cisco Platforms

The NIM-2FXS/4FXO was designed for compatible Cisco 4000 Series Integrated Services Routers and is also supported in certain Cisco voice gateway platforms. Cisco documentation lists the module for use with platforms including the Cisco 4300 and 4400 Series ISRs, with additional compatibility depending on the specific router model and software configuration.

Important Compatibility Note

Cisco has also introduced the NIM-2FXS/4FXOP as the successor to the original NIM-2FXS/4FXO following an end-of-sale announcement. Cisco lists the original NIM-2FXS/4FXO as an end-of-sale product and identifies the NIM-2FXS/4FXOP as its replacement for applicable configurations. Verify the exact router model, IOS XE release, and module compatibility before installation.

Applications

The Cisco NIM-2FXS/4FXO is suitable for:

• Analog telephone connectivity
• PSTN gateway applications
• Fax connectivity
• Branch-office voice deployments
• Analog device integration
• Cisco Unified Communications environments
• Voice gateway applications

The Cisco NIM-2FXS/4FXO provides a practical combination of six analog voice interfaces in a single module, making it useful for integrating traditional analog telephone services and devices with compatible Cisco IP-based voice infrastructure.